|Publication number||US7315037 B1|
|Application number||US 11/325,180|
|Publication date||Jan 1, 2008|
|Filing date||Jan 4, 2006|
|Priority date||Jan 4, 2006|
|Also published as||EP1969413A2, EP1969413A4, EP1969413B1, WO2007081735A2, WO2007081735A3|
|Publication number||11325180, 325180, US 7315037 B1, US 7315037B1, US-B1-7315037, US7315037 B1, US7315037B1|
|Inventors||David J. Page, Brian M. Spahnie|
|Original Assignee||Lumitex, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (4), Non-Patent Citations (2), Referenced by (4), Classifications (13), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This invention relates generally to an infrared identification device that allows for easy identification of friendly troops or law enforcement personnel, objects or positions at night using night vision equipment.
Night vision equipment is commonly used by the military when carrying out night operations. However, even with night vision equipment it is oftentimes difficult for ground troops and air support to identify friendly troops as well as objects such as equipment or positions and the like at night.
Infrared flashlights have been used to make it somewhat easier to identify friendly troops at night using night vision equipment. However, infrared flashlights have the objection that they give off a narrow beam of infrared light that can only be seen in one direction through night vision equipment, making it difficult to pick up with night vision equipment. Also such infrared flashlights are very limited in the type of signals that they can emit. Moreover, they are not capable of functioning in an interrogation mode allowing them to be activated remotely by a predetermined signal frequency, code signal or pulse sequence or the like and send out an appropriate signal response.
The present invention relates to an infrared identification device that allows for easy recognition, identification and tracking of friendly troops or law enforcement personnel at night when viewed through night vision equipment. Also the device may be used to identify objects or positions at night.
In accordance with one aspect of the invention, the device includes a light emitting panel having a relatively large surface area for emitting infrared light received from an infrared light source, making it relatively easy to detect at night when viewed through night vision equipment.
In accordance with another aspect of the invention, the device is flexible and lightweight for ease of attachment to a person or a person's clothing, gear or equipment in a variety of configurations. Also the device is water resistant and durable.
In accordance with another aspect of the invention, the panel member may be formed into different three-dimensional shapes for easier viewing at night from different directions through night vision equipment.
In accordance with another aspect of the invention, the device may include a controller for controlling operation of the device.
In accordance with another aspect of the invention, the controller may provide different operating modes for the light source.
In accordance with another aspect of the invention, the controller may be programmable to permit the device to emit different infrared light patterns including custom blinking patterns.
In accordance with another aspect of the invention, the device may include one control button for turning the light source on and selecting different brightness modes of the light source, and another control button for selecting a constant on mode or different blinking modes of the light source in any of the brightness modes.
In accordance with another aspect of the invention, either or both of the control buttons may be used to turn the light source off by pressing the control buttons for a predetermined time interval.
In accordance with another aspect of the invention, the device may be used to both send and receive infrared signals.
In accordance with another aspect of the invention, the device may be capable of functioning in an interrogation mode, allowing the device to be activated remotely by a predetermined signal frequency, code signal or pulse signal and send out an appropriate identifying signal.
In accordance with another aspect of the invention, the device may include a detector for detecting a predetermined incoming signal to activate the device and cause the device to emit a signal response.
In accordance with another aspect of the invention, the detector may be an infrared detector that detects infrared light picked up by the panel member from an external source when the device is turned off.
In accordance with another aspect of the invention, the device may include a visual indicator lamp that mimics different output modes of the light source.
In accordance with another aspect of the invention, the visual indicator lamp may also function as a low power source indicator by emitting a different visual signal than the signal mimicking the different output modes of the light source when the remaining life of the power source drops below a predetermined level.
In accordance with another aspect of the invention, the device may include a protective fabric cover that protects the panel member against abrasion and includes a fabric layer overlying the light emitting surface area of the panel member that allows infrared light rays to penetrate without significant loss.
In accordance with another aspect of the invention, the protective fabric cover may include another fabric layer that covers the back side and side edges of the panel member to block out infrared light rays and may overlap opposite side edges of the fabric layer overlying the light emitting surface area to form a window that is easily penetrated by infrared light rays.
In accordance with another aspect of the invention, a housing for the infrared light source, power source and controller may be connected to one end of the protective fabric cover.
In accordance with another aspect of the invention, a flexible back reflector may be located within the protective fabric cover adjacent the opposite side of the panel member.
In accordance with another aspect of the invention, a plurality of such panel members may be arranged in the shape of a marker on one side of a mat and lighted by infrared light sources adjacent one or both ends of the panel members to allow for easy identification of objects or positions at night marked by the mat when viewed through night vision equipment.
These and other objects, advantages, features and aspects of the invention will become apparent as the following description proceeds.
To the accomplishment of the foregoing and related ends, the invention, then, comprises the features hereinafter more fully described and particularly pointed out in the claims, the following description and the annexed drawings setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but several of the various ways in which the principles of the invention may be employed.
Referring now in detail to the drawings, wherein like reference numerals are used to designate like parts, and initially to
Light emitting panel member 3 may be comprised of one or more layers of woven or non-woven optical fibers 10 (see
The ends of the optical fibers 10 may be brought together to form a tail portion 11 having a connector 12 surrounding the outermost ends of the fibers which serves as an interface between the light source 4 and panel member 3. The light emitting surface area 5 of panel member 3 is larger than the cross sectional area of the bundled outermost ends of the fibers to reduce energy density by spreading the light over the larger light emitting surface area of the panel member.
To cause conducted light to be emitted from the light emitting surface area 5 of the panel member 3, the external surface of the optical fibers may be disrupted or deformed along their length as by roughening, marring, abrading, etching, grit blasting or thermally deforming one or both sides of the optical fibers. Alternatively, light may be caused to be emitted from the optical fibers by weaving the optical fibers to produce bends in the optical fibers that cause a percentage of the light to escape at the bends. If desired, the light emitting panel member may also be made of a solid transparent material having disruptions or deformities on one or both sides for causing light entering the panel member to be emitted from the light emitting surface area. The amount of light emitted from the light emitting surface area will depend on the depth and frequency of the disruptions or bends. If the panel member is deformed or bent at decreasingly spaced intervals as the distance from the light source increases, there will be a more uniform emission of infrared light from the light emitting surface area.
To protect the panel member 3 against possible abrasion and still permit the panel member to be flexed into a variety of different configurations for ease of looping around a person's arm or shoulder or attachment to a person's clothing, gear or other equipment, the panel member may be contained in a protective fabric cover or pouch 15 including a relatively thin fabric layer 16 overlying the light emitting surface area 5 of the panel member that allows infrared light rays to penetrate without significant loss. The rest of the protective fabric cover 15 may comprise a heavier fabric layer 17 that covers the opposite side and opposite side edges of the panel member to block out infrared light rays. Opposite side edges of the heavier fabric layer 17 may overlap opposite side edges of the thinner fabric layer 16 where the two fabric layers may be secured together as by stitching or using a suitable adhesive to form a relatively large window 18 through which infrared light rays emitted by the light emitting surface area 5 of the panel member may be emitted. One such fabric that has been found to be suitable for this purpose is a urethane coated 400 denier nylon fabric having a fabric layer thickness of approximately 0.014 inch overlying the light emitting surface area and a fabric layer thickness of approximately 0.023 inch overlying the other surface areas of the panel member. Also the thicker fabric layer 17 may be black in color, and the thinner fabric layer 16 may be tan.
A flexible reflective member 20 may be placed inside the fabric cover 15 adjacent the back side of the panel member to act as a back reflector and to allow flexure of the panel member along its length.
One end 21 of the fabric cover 15 is open for insertion of the panel member 3 and back reflector 20 inside the fabric cover. A generally U-shaped notch 22 may be provided in such open end for receipt of the connector 12 at the light input end of panel member 3 to expose the light input end to the light source 4 within the housing 7. Also a pair of holes 23 may be provided in such open end adjacent opposite sides of the notch 22 for hooking over posts 24 in the housing to secure the open end of the fabric cover to the housing with the connector in close proximity to the light source within the housing.
The other end 26 of the fabric cover 15 may be looped through a D ring 27 and secured to itself for attaching the D ring to the other end of the fabric cover. Another D ring 28 may be on the housing 7 to provide connection points at both ends of the device, and to allow the device to be looped around a person's arm or shoulder as by tying the two D rings together using zip ties or elastic straps or the like. Patches of hook type fasteners 29 may be attached to the back side of the housing 7 and/or to the fabric layer 17 to permit the device to be attached to loop type fasteners on clothing, combat gear or equipment and the like.
The infrared light source 4 may be one or more infrared light emitting diodes. One such infrared light source 4 is shown in
A battery of any suitable type may be used as the power source 6.
Various modes of operation of the device 1 may be controlled by selectively pressing a pair of control buttons 40 and 41 accessible through openings 42 in the housing lid 32. One of the control buttons 40 may be used to cycle the light source 4 from an off position to different brightness modes of the light source each time the button is pressed. For example, the light source may be cycled between a high brightness mode which may typically be used for interaction with aircraft or command and control over relatively long distances (e.g., between 200 and 5,000 yards); a medium brightness mode which may typically be used for ground troop coordination and interaction over medium distances (e.g., 25 to 200 yards); and a low brightness mode which may typically be used for close in operations (e.g., of less than 25 yards). The other control button 41 may be used to cycle the light source between a constant on mode and different blinking modes each time the button is pressed, for example, a fast blinking mode or a slow blinking mode. Blinking modes will extend the battery life and make it easier for friendly forces to pick out the infrared signal emitted by the device over background clutter of other infrared light sources.
Emergency shutdown of the device 1 may be achieved by pressing either or both control buttons 40 and 41 for a somewhat longer period of time, for example, 1.2 seconds. Also, an emergency shutoff button 43, schematically shown in
The various operating modes of the device may be controlled by a suitable controller 44 such as a microprocessor 45, also schematically shown in
The device may include a self-diagnostics feature in the circuitry to monitor the current to the light source to verify that the light source is on and to turn the device off if the current goes above or drops below a set limit. Also, a visual indicator lamp 48 such as a red light, schematically shown in
Device 1 may also be capable of functioning in an interrogation mode, allowing the device to be turned on remotely by infrared or radio frequency interrogation, which may be encrypted. This may be accomplished, for example, by friendly troops using a directional antenna mounted on night vision equipment, a rifle scope, or a spotlight. If the interrogation signal is an infrared signal, the panel member 3 may be illuminated by the infrared signal and detected by an infrared detector 50 adjacent the connector 12 at the input end of the panel member as schematically shown in
The device may also contain encryption, interrogation, timed lockout, and/or wireless activation features to protect against the device being used in the event that it should fall into the enemy's hands. Also an overlay with predetermined letters and numbers may be placed over the light emitting surface area of the panel member to designate friendly units.
Although the dimensions of the device 1 may vary within certain limits, by way of example, the device may have an overall length of approximately 12 inches and the panel member 2 may have a thickness of approximately 0.050 inch, a length of approximately 7 inches and a width of approximately 1.7 inches, with a light emitting surface area 5 (which may include the tail portion 11) that is visible through window 18 of at least 4 inches by 1.5 inches. The back reflector 20 may have a thickness of approximately 0.020 inch. Because the panel member, back reflector and protective cover are all flexible, the assembly 2 can take three-dimensional shapes, making it easier to detect infrared light signals emitted by the light emitting surface area of the panel member at night when viewed through night vision equipment and to pick up incoming infrared signals when in an interrogation mode.
All of the panel members 62, 64 and their associated infrared light sources 66 may be secured in place by attaching a protective fabric cover 67 to the mat in overlying relation to the panel members and light sources. The portions 68 of the protective cover overlying the light emitting surface areas 69 of the panel members may be made of a suitable fabric material that protects the panel members against abrasion and allows infrared light to penetrate without significant loss, similar to the fabric cover layer 16 of the
One or more infrared light sources 66 may be located adjacent one or both ends of the panel members for transmission of infrared light from the light sources through the panel members for emission from the light emitting surface areas. In the embodiment shown in
All of the infrared light sources 66 of the
Although the invention has been shown and described with respect to certain embodiments, it is obvious that equivalent alterations and modifications will occur to others skilled in the art upon the reading and understanding of the specification. In particular, with regard to the various functions performed by the above described components, the terms (including any reference to a “means”) used to describe such components are intended to correspond, unless otherwise indicated, to any component which performs the specified function of the described component (e.g., that is functionally equivalent), even though not structurally equivalent to the disclosed component which performs the function in the herein illustrated exemplary embodiments of the invention. Also, all of the disclosed functions may be computerized and automated as desired. In addition, while a particular feature of the invention may have been disclosed with respect to only one embodiment, such feature may be combined with one or more other features as may be desired and advantageous for any given or particular application.
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|Citing Patent||Filing date||Publication date||Applicant||Title|
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|U.S. Classification||250/504.00R, 250/493.1, 250/495.1, 340/983, 116/42, 362/103, 116/7, 362/190|
|Cooperative Classification||G01S17/74, F41J2/00|
|European Classification||F41J2/00, G01S17/74|
|Jan 17, 2006||AS||Assignment|
Owner name: LUMITEX, INC., OHIO
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:PAGE, DAVID J.;SPAHNIE, BRIAN M.;REEL/FRAME:017201/0102
Effective date: 20051220
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|Jul 29, 2011||FPAY||Fee payment|
Year of fee payment: 4
|Jun 23, 2015||FPAY||Fee payment|
Year of fee payment: 8